The Youth Self Report (YSR), developed by Achenbach et al. [17], was used in its 2001 version. The Chinese version was translated and revised by Wang Runcheng et al.[18] in 2013. The questionnaire is divided into 8 factors (Anxiety/Depression, Withdrawn/Depressed, Somatic Complaints, Social Problems, Thought Problems, Attention Problems, Delinquent Behavior, Aggressive Behavior) and an "Other Problems" item. The Delinquent Behavior and Aggressive Behavior factors together constitute the externalizing symptom group and are widely used to measure externalizing problem behaviors in adolescents. The Delinquent Behavior factor includes 15 items, and the Aggressive Behavior factor includes 17 items, using a three-point scoring scale (0 = not at all true, 1 = somewhat true, 2 = very true). The total score for the two factors ranges from 0 to 96, with higher scores indicating more severe externalizing problem behaviors. In this study, the Cronbach's α coefficients for the Delinquent Behavior

The 8-item Brief Sensation Seeking Scale developed by Hoyle et al.[19] was utilized, with the Chinese version translated and revised by Xinguang Chen et al.[20] in 2013 to measure personality traits related to sensation seeking. This scale comprises 8 items, encompassing four dimensions: Lack of Self-Control, Pursuit of Novelty, Difficulty Tolerating Monotony, and Pursuit of New Experiences. A five-point Likert scale was used for scoring (1 = strongly disagree, 2 = disagree, 3 = neutral, 4 = agree, 5 = strongly agree). The total score ranges from 8 to 40, with higher scores indicating higher levels of sensation seeking. In this study, the Cronbach's α coefficient for the Chinese version of the scale was 0.855.

The Power of Food Scale developed by Lowe et al.[21] was employed, with the Chinese version translated and revised by Han Xiao, Jianwen Song, Xinni Han et al.[22] in 2023, to measure the level of hedonic hunger. The scale consists of 15 items, which include three dimensions: Food Availability, Food Presence, and Food Taste, utilizing a five-point Likert scale for scoring (1 = I disagree, 2 = I somewhat agree, 3 = I somewhat agree, 4 = I fairly agree, 5 = I completely agree). The total score ranges from 15 to 75, with higher total scores indicating a greater level of hedonic hunger. In this study, the Cronbach's α coefficient for the Chinese version of the scale was 0.940, and the Cronbach's α coefficients for the three dimensions (Food Availability, Food Presence, Food Taste) were 0.866, 0.858, and 0.863, respectively.

Permissive attitude towards drug abuse developed by the Hong Kong Security Bureau's Narcotics Division is adopted (https://www.nd.gov.hk/tc/beat\_questions\_2010R2.html). The scale consists of 21 questions and uses a 5-point Likert scale (1 = Strongly Disagree, 2 = Disagree, 3 = Unsure, 4 = Agree, 5 = Strongly Agree). The total score ranges from 21 to 105, with a higher score indicating a higher tolerance attitude towards drug use. In this study, the Cronbach's α coefficient for the Chinese version of this scale is 0.966.

The Refusal Self-Efficacy Scale developed by Gerdien et al.[23] is adopted (Self-Efficacy List for Drug Users, SELD), with the Chinese version translated and revised by Liuna Geng et al.[24], used to measure refusal self-efficacy regarding drugs. The scale consists of 17 questions encompassing three dimensions: environmental factors, negative emotions, and positive emotions, using a 5-point Likert scale (1 = Very Easy to Refuse, 2 = Easy to Refuse, 3 = Unsure, 4 = Somewhat Difficult to Refuse, 5 = Very Difficult to Refuse). The total score ranges from 17 to 85, with a higher score indicating lower refusal self-efficacy. In this study, the Cronbach's α coefficient for the Chinese version of this scale is 0.961, and the Cronbach's α coefficients for the three dimensions (environmental factors, negative emotions, positive emotions) are 0.901, 0.928, and 0.937, respectively.

The Adverse Childhood Experiences Scale developed by the Kaiser-CDC laboratory is adopted to investigate various adverse events experienced by subjects before the age of 18[25]. The scale includes three dimensions: abuse, neglect, and family dysfunction, with a total of 10 items. Each item offers two response options: "Yes" and "No." A "Yes" response is scored as 1 point, while a "No" response is scored as 0 points. The total score is the sum of the scores from each item, reflecting the number of adverse childhood experiences. The total score ranges from 0 to 10, with a higher score indicating more adverse childhood experiences. In this study, the Cronbach's α coefficient for the Chinese version of this scale is 0.760.

It is a binary outcome. The investigators will ask for question that "Are there peers around you engage in drug use?" And the participants are supposed to answer "yes" or "no"

The investigators will ask for question that "Do you have any work experience in special venues such as bars or nightclubs?" And the participants are supposed to choose the special venues they used to work including "Bar", "Internet cafe", "Ballroom", "Nightclub", "KTV", "Disco", "Leisure clubhouse", "Agriturismo" or choose "None of the above" if they have never work in such special venues.